moment/src/lib/units/week-calendar-utils.js

Parse, validate, manipulate, and display dates

import { daysInYear } from './year';
import { createUTCDate } from '../create/date-from-array';

// start-of-first-week - start-of-year
function firstWeekOffset(year, dow, doy) {
    var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
        fwd = 7 + dow - doy,
        // first-week day local weekday -- which local weekday is fwd
        fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7;

    return -fwdlw + fwd - 1;
}

// https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
export function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
    var localWeekday = (7 + weekday - dow) % 7,
        weekOffset = firstWeekOffset(year, dow, doy),
        dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
        resYear,
        resDayOfYear;

    if (dayOfYear <= 0) {
        resYear = year - 1;
        resDayOfYear = daysInYear(resYear) + dayOfYear;
    } else if (dayOfYear > daysInYear(year)) {
        resYear = year + 1;
        resDayOfYear = dayOfYear - daysInYear(year);
    } else {
        resYear = year;
        resDayOfYear = dayOfYear;
    }

    return {
        year: resYear,
        dayOfYear: resDayOfYear,
    };
}

function weekOfYearFromDayOfYear(year, dayOfYear, dow, doy) {
    var weekOffset = firstWeekOffset(year, dow, doy),
        week = Math.floor((dayOfYear - weekOffset - 1) / 7) + 1,
        resWeek,
        resYear;

    if (week < 1) {
        resYear = year - 1;
        resWeek = week + weeksInYear(resYear, dow, doy);
    } else if (week > weeksInYear(year, dow, doy)) {
        resWeek = week - weeksInYear(year, dow, doy);
        resYear = year + 1;
    } else {
        resYear = year;
        resWeek = week;
    }

    return {
        week: resWeek,
        year: resYear,
    };
}

export function weekOfYear(mom, dow, doy) {
    return weekOfYearFromDayOfYear(mom.year(), mom.dayOfYear(), dow, doy);
}

export function weekOfYearFromDate(year, month, date, dow, doy) {
    var dayOfYear =
        Math.round(
            (createUTCDate(year, month, date) - createUTCDate(year, 0, 1)) /
                864e5
        ) + 1;

    return weekOfYearFromDayOfYear(year, dayOfYear, dow, doy);
}

export function weeksInYear(year, dow, doy) {
    var weekOffset = firstWeekOffset(year, dow, doy),
        weekOffsetNext = firstWeekOffset(year + 1, dow, doy);
    return (daysInYear(year) - weekOffset + weekOffsetNext) / 7;
}